Good Morning Britain viewers were quick to point out a royal blunder as they tuned into the show on Friday. Ben Shephard was hosting the ITV show alongside pal Kate Garraway and the pair were keen to discuss the Duke and Duchess of Cambridge's tenth wedding anniversary.
The royal couple marked a decade of marriage by sharing an adorable family video on Thursday, which showed them and their three children enjoying a trip to the beach.
As he introduced the video, dad-of-two Ben suffered a faux pas and GMB fans noticed straight away. Ben, 46, referred to Prince William and his wife Kate as the Duke and Duchess of Sussex, when their actual title is the Duke and Duchess of Cambridge.
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